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#networking
2 posts
October 22, 2026
Subnet mask and CIDR explained, with a cheat sheet
What a subnet mask actually does, how /24 and 255.255.255.0 are the same thing, how to find the network, broadcast and usable hosts by hand, and a CIDR cheat sheet from /8 to /32.
September 17, 2026
How to scan business cards into iPhone Contacts — and what the built-in tools miss
Live Text can copy a phone number off a card, but there's no built-in card-to-Contacts flow on iPhone. Here's the manual route, its friction, and the one-tap offline alternative.